package zwz.importTask.utils;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

@Configuration
public class ExecutorConfig {

    @Value("${executorConfig.corePoolSize:8}")
    int corePoolSize;
    @Value("${executorConfig.maxPoolSize:16}")
    int maxPoolSize;
    @Value("${executorConfig.queueCapacity:100}")
    int queueCapacity;
    @Value("${executorConfig.threadNamePrefix:async-service-}")
    String threadNamePrefix;

    @Bean
    public ThreadPoolTaskExecutor taskExecutor() {

        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //配置核心线程数
        executor.setCorePoolSize(corePoolSize);

        //配置最大线程数
        executor.setMaxPoolSize(maxPoolSize);

        //配置队列大小
        executor.setQueueCapacity(queueCapacity);

        //配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix(threadNamePrefix);

        executor.setWaitForTasksToCompleteOnShutdown(true);
        executor.setAwaitTerminationSeconds(60);

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是由调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());

        //执行初始化
        executor.initialize();

        return executor;
    }

}
